FAAS determination of gold and palladium using an on-line separation and preconcentration system based on a high-selective chelating adsorbent

A 2-mercaptothiazoline immobilized silica gel (MTLSG) was: synthesized and used for flow injection (FI) on-line separation and preconcentration, coupl ed with flame atomic absorption spectrometry (FAAS). Au(III) and Pd(II) wer e preconcentrated onto a micro column packed with MTLSG and then directly e luted into the AAS with thiourea/HCl or thiourea solution, respectively. Th e base metal ions (25.0 mg mL(-1)) and anions (100.0 mg mL(-1)) did not int erfere in the determination of Au(III) and Pd(II). The detection limits, fo r Au(III) and Pd(II) were 4.4 ng mL(-1) and 7.5 ng mL(-1), respectively, wi th a sample loading flow rate of 5.0 mL min(-1) and a preconcentration time of 60 s. The precision for 11 replicate determinations was 1.2% and 2.6% r elative standard deviation (RSD), calculated with peak area measurements: T he calibration curves for Au(III) and Pd(11): were linear with a correlatio n coefficient of 0.9997 and 0.9999 in concentration ranges. of 0.1 similar to 2.0 mug mL(-1) and 0.1 similar to 3.5 mug mL(-1), respectively. The meth od was successfully applied to the determination of Au(III) and Pd(II) in g eological and metallurgical samples.